Who needs a photo under 150 KB?
150 KB is a frequent limit on job portals, bank and insurance KYC uploads and some state recruitment sites, and a good middle ground when 100 KB looks too soft.
Getting the best quality at 150 KB
At 150 KB a phone photo keeps nearly all its detail at around 2000 pixels wide. For scanned documents, crop the edges of the desk or table first so the KB go to the text.
What size will the picture be?
About 1900–2100 pixels wide in JPG from a phone photo.
Questions
Is 150 KB enough for a document scan?
For a single page, yes: text stays clear. For several pages, make one PDF and use Compress PDF instead.
Can I compress many photos to 150 KB each?
Yes. Every file in the batch is brought under 150 KB separately and they download together as a ZIP.
How do I make a JPG less than 150 KB?
Drop the photo in and press Compress: the size is already set, so the JPG always comes out under 150 KB. Phone photos and iPhone HEIC files work too, and you can do many at once.